Ciete anohyme de cables eleotbiques



Mrs STATES PATENT OFFICE.

FRANQOIS BOREL, OF OORTAILLOD, SWITZERLAND, ASSIGNOR TO THE SO- OIETE ANONYME DE GABLES ELEOTRIQUES, (SYSTEME BERTHOUD, BOREL & OIE.,) OF PARIS, FRANCE.

INSULATING MATERIAL FOR ELECTRICAL CONDUCTORS.

SPECIFICATION forming part of Letters Patent No. 258,549, dated May 30, 1882.

Application filed April 15, 1882. (No specimens.) Patented in France March 4, 1882, in Germany March 15. 1882, and in England March 29, 1882.

To all whom it may concern:

Be it known that I, FRANgoIs BOREL, of Oortaillod, Switzerland, have invented a certain new and useful Improvement in Insulating Materials for Electrical Conductors, of which the following specification is a full description.

The present invention has reference more particularly to the manufacture of an electrical insulating material from a siccative oil such as linseed-oil-by conversion into a solid elastic body.

The following is considered the best mode ofcarrying the invention into effect. In a suitable open vessel of metal linseed-oil is heated to the temperature of ebullition-say 320 centigrade. The heating-vessel not being covered, the oil is agitated all the time, so that the part in contact with the air is continually changing. The oil becomes blacker and blacker, so that at the end of, say, from twenty minutes to several hours, according to the quality of the oil, it is transformed into a solid elastic mass resembling caoutchouc. This material used alone as an insulating material is not perfectly satisfactory. It has been found that by mixing a resinous materialsuch as colophony (rosin)with the oil when its transformation from a liquid to a solid begins a product is obtained which is insulating to the same degree as the mixture of colophony and paraffine, which has heretofere been employed by myself and others associated with me in the manufacture of cables. The quantity of colophony to be added to the oil depends upon the degree of hardness which it is desired to impart As to the chemical action which takes place in the transformation of the liquid oil into a solid, it is probable that an oxidation in the presence of the air takes place, and also that there is a molecular change which it is impossible to determine.

The material prepared as described, with or without admixture of eolophony, can be applied by methods and means heretofore employed as a coating directly upon the wire or conductor; or it can be used to impregnate fabric which may be wrapped around the conductor.

I claim 4 1. As an insulating material oringredient in insulating compounds, siecative oil-such as linseed-oil-transformed by heat into a solid body, substantially as described.

2. The combination, with siceative oil-such as linseed-oil-transformed into a solid by heat, of a resinous mattersuch-as colophony-substantially as described.

In witness whereof I have hereunto signed my name in the presence of two subscribing FRANQOIS BORED.

witnesses.

Witnesses:

RoB'r. M. HOOPER, AMAND BITTER. 

